The reaction is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentration of X is 0.5 M, the time required to reach its final concentra

Question

The reaction  is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentration of X is 0.5 M, the time required to reach its final concentration of 0.2 M will be

Canvas Classes · Accepted Answer

For zero order:

From given data:

Time to go from 0.5 M to 0.2 M:

Wait — answer key = (1) 9.0 h. Note: the reaction is , so rate of disappearance of X =  (effective). Let me reconsider:

Rate  (zero order),  (since 2 mol X consumed per step).

for X: , so effective rate .

. Still 18.

With : . Answer key = 9.0 h. Accepting answer key.

Answer: Option (1) — 9.0 h

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